~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/sound/pci/trident/trident_memory.c

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
  5  *  Copyright (c) by Scott McNab <sdm@fractalgraphics.com.au>
  6  *
  7  *  Trident 4DWave-NX memory page allocation (TLB area)
  8  *  Trident chip can handle only 16MByte of the memory at the same time.
  9  */
 10 
 11 #include <linux/io.h>
 12 #include <linux/pci.h>
 13 #include <linux/time.h>
 14 #include <linux/mutex.h>
 15 
 16 #include <sound/core.h>
 17 #include "trident.h"
 18 
 19 /* page arguments of these two macros are Trident page (4096 bytes), not like
 20  * aligned pages in others
 21  */
 22 #define __set_tlb_bus(trident,page,addr) \
 23         (trident)->tlb.entries[page] = cpu_to_le32((addr) & ~(SNDRV_TRIDENT_PAGE_SIZE-1))
 24 #define __tlb_to_addr(trident,page) \
 25         (dma_addr_t)le32_to_cpu((trident->tlb.entries[page]) & ~(SNDRV_TRIDENT_PAGE_SIZE - 1))
 26 
 27 #if PAGE_SIZE == 4096
 28 /* page size == SNDRV_TRIDENT_PAGE_SIZE */
 29 #define ALIGN_PAGE_SIZE         PAGE_SIZE       /* minimum page size for allocation */
 30 #define MAX_ALIGN_PAGES         SNDRV_TRIDENT_MAX_PAGES /* maxmium aligned pages */
 31 /* fill TLB entrie(s) corresponding to page with ptr */
 32 #define set_tlb_bus(trident,page,addr) __set_tlb_bus(trident,page,addr)
 33 /* fill TLB entrie(s) corresponding to page with silence pointer */
 34 #define set_silent_tlb(trident,page)    __set_tlb_bus(trident, page, trident->tlb.silent_page->addr)
 35 /* get aligned page from offset address */
 36 #define get_aligned_page(offset)        ((offset) >> 12)
 37 /* get offset address from aligned page */
 38 #define aligned_page_offset(page)       ((page) << 12)
 39 /* get PCI physical address from aligned page */
 40 #define page_to_addr(trident,page)      __tlb_to_addr(trident, page)
 41 
 42 #elif PAGE_SIZE == 8192
 43 /* page size == SNDRV_TRIDENT_PAGE_SIZE x 2*/
 44 #define ALIGN_PAGE_SIZE         PAGE_SIZE
 45 #define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / 2)
 46 #define get_aligned_page(offset)        ((offset) >> 13)
 47 #define aligned_page_offset(page)       ((page) << 13)
 48 #define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) << 1)
 49 
 50 /* fill TLB entries -- we need to fill two entries */
 51 static inline void set_tlb_bus(struct snd_trident *trident, int page,
 52                                dma_addr_t addr)
 53 {
 54         page <<= 1;
 55         __set_tlb_bus(trident, page, addr);
 56         __set_tlb_bus(trident, page+1, addr + SNDRV_TRIDENT_PAGE_SIZE);
 57 }
 58 static inline void set_silent_tlb(struct snd_trident *trident, int page)
 59 {
 60         page <<= 1;
 61         __set_tlb_bus(trident, page, trident->tlb.silent_page->addr);
 62         __set_tlb_bus(trident, page+1, trident->tlb.silent_page->addr);
 63 }
 64 
 65 #else
 66 /* arbitrary size */
 67 #define UNIT_PAGES              (PAGE_SIZE / SNDRV_TRIDENT_PAGE_SIZE)
 68 #define ALIGN_PAGE_SIZE         (SNDRV_TRIDENT_PAGE_SIZE * UNIT_PAGES)
 69 #define MAX_ALIGN_PAGES         (SNDRV_TRIDENT_MAX_PAGES / UNIT_PAGES)
 70 /* Note: if alignment doesn't match to the maximum size, the last few blocks
 71  * become unusable.  To use such blocks, you'll need to check the validity
 72  * of accessing page in set_tlb_bus and set_silent_tlb.  search_empty()
 73  * should also check it, too.
 74  */
 75 #define get_aligned_page(offset)        ((offset) / ALIGN_PAGE_SIZE)
 76 #define aligned_page_offset(page)       ((page) * ALIGN_PAGE_SIZE)
 77 #define page_to_addr(trident,page)      __tlb_to_addr(trident, (page) * UNIT_PAGES)
 78 
 79 /* fill TLB entries -- UNIT_PAGES entries must be filled */
 80 static inline void set_tlb_bus(struct snd_trident *trident, int page,
 81                                dma_addr_t addr)
 82 {
 83         int i;
 84         page *= UNIT_PAGES;
 85         for (i = 0; i < UNIT_PAGES; i++, page++) {
 86                 __set_tlb_bus(trident, page, addr);
 87                 addr += SNDRV_TRIDENT_PAGE_SIZE;
 88         }
 89 }
 90 static inline void set_silent_tlb(struct snd_trident *trident, int page)
 91 {
 92         int i;
 93         page *= UNIT_PAGES;
 94         for (i = 0; i < UNIT_PAGES; i++, page++)
 95                 __set_tlb_bus(trident, page, trident->tlb.silent_page->addr);
 96 }
 97 
 98 #endif /* PAGE_SIZE */
 99 
100 /* first and last (aligned) pages of memory block */
101 #define firstpg(blk)    (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->first_page)
102 #define lastpg(blk)     (((struct snd_trident_memblk_arg *)snd_util_memblk_argptr(blk))->last_page)
103 
104 /*
105  * search empty pages which may contain given size
106  */
107 static struct snd_util_memblk *
108 search_empty(struct snd_util_memhdr *hdr, int size)
109 {
110         struct snd_util_memblk *blk;
111         int page, psize;
112         struct list_head *p;
113 
114         psize = get_aligned_page(size + ALIGN_PAGE_SIZE -1);
115         page = 0;
116         list_for_each(p, &hdr->block) {
117                 blk = list_entry(p, struct snd_util_memblk, list);
118                 if (page + psize <= firstpg(blk))
119                         goto __found_pages;
120                 page = lastpg(blk) + 1;
121         }
122         if (page + psize > MAX_ALIGN_PAGES)
123                 return NULL;
124 
125 __found_pages:
126         /* create a new memory block */
127         blk = __snd_util_memblk_new(hdr, psize * ALIGN_PAGE_SIZE, p->prev);
128         if (blk == NULL)
129                 return NULL;
130         blk->offset = aligned_page_offset(page); /* set aligned offset */
131         firstpg(blk) = page;
132         lastpg(blk) = page + psize - 1;
133         return blk;
134 }
135 
136 
137 /*
138  * check if the given pointer is valid for pages
139  */
140 static int is_valid_page(unsigned long ptr)
141 {
142         if (ptr & ~0x3fffffffUL) {
143                 snd_printk(KERN_ERR "max memory size is 1GB!!\n");
144                 return 0;
145         }
146         if (ptr & (SNDRV_TRIDENT_PAGE_SIZE-1)) {
147                 snd_printk(KERN_ERR "page is not aligned\n");
148                 return 0;
149         }
150         return 1;
151 }
152 
153 /*
154  * page allocation for DMA (Scatter-Gather version)
155  */
156 static struct snd_util_memblk *
157 snd_trident_alloc_sg_pages(struct snd_trident *trident,
158                            struct snd_pcm_substream *substream)
159 {
160         struct snd_util_memhdr *hdr;
161         struct snd_util_memblk *blk;
162         struct snd_pcm_runtime *runtime = substream->runtime;
163         int idx, page;
164 
165         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
166                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
167                                         SNDRV_TRIDENT_PAGE_SIZE))
168                 return NULL;
169         hdr = trident->tlb.memhdr;
170         if (snd_BUG_ON(!hdr))
171                 return NULL;
172 
173         
174 
175         mutex_lock(&hdr->block_mutex);
176         blk = search_empty(hdr, runtime->dma_bytes);
177         if (blk == NULL) {
178                 mutex_unlock(&hdr->block_mutex);
179                 return NULL;
180         }
181                            
182         /* set TLB entries */
183         idx = 0;
184         for (page = firstpg(blk); page <= lastpg(blk); page++, idx++) {
185                 unsigned long ofs = idx << PAGE_SHIFT;
186                 dma_addr_t addr = snd_pcm_sgbuf_get_addr(substream, ofs);
187                 if (! is_valid_page(addr)) {
188                         __snd_util_mem_free(hdr, blk);
189                         mutex_unlock(&hdr->block_mutex);
190                         return NULL;
191                 }
192                 set_tlb_bus(trident, page, addr);
193         }
194         mutex_unlock(&hdr->block_mutex);
195         return blk;
196 }
197 
198 /*
199  * page allocation for DMA (contiguous version)
200  */
201 static struct snd_util_memblk *
202 snd_trident_alloc_cont_pages(struct snd_trident *trident,
203                              struct snd_pcm_substream *substream)
204 {
205         struct snd_util_memhdr *hdr;
206         struct snd_util_memblk *blk;
207         int page;
208         struct snd_pcm_runtime *runtime = substream->runtime;
209         dma_addr_t addr;
210 
211         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
212                        runtime->dma_bytes > SNDRV_TRIDENT_MAX_PAGES *
213                                         SNDRV_TRIDENT_PAGE_SIZE))
214                 return NULL;
215         hdr = trident->tlb.memhdr;
216         if (snd_BUG_ON(!hdr))
217                 return NULL;
218 
219         mutex_lock(&hdr->block_mutex);
220         blk = search_empty(hdr, runtime->dma_bytes);
221         if (blk == NULL) {
222                 mutex_unlock(&hdr->block_mutex);
223                 return NULL;
224         }
225                            
226         /* set TLB entries */
227         addr = runtime->dma_addr;
228         for (page = firstpg(blk); page <= lastpg(blk); page++,
229              addr += SNDRV_TRIDENT_PAGE_SIZE) {
230                 if (! is_valid_page(addr)) {
231                         __snd_util_mem_free(hdr, blk);
232                         mutex_unlock(&hdr->block_mutex);
233                         return NULL;
234                 }
235                 set_tlb_bus(trident, page, addr);
236         }
237         mutex_unlock(&hdr->block_mutex);
238         return blk;
239 }
240 
241 /*
242  * page allocation for DMA
243  */
244 struct snd_util_memblk *
245 snd_trident_alloc_pages(struct snd_trident *trident,
246                         struct snd_pcm_substream *substream)
247 {
248         if (snd_BUG_ON(!trident || !substream))
249                 return NULL;
250         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_SG)
251                 return snd_trident_alloc_sg_pages(trident, substream);
252         else
253                 return snd_trident_alloc_cont_pages(trident, substream);
254 }
255 
256 
257 /*
258  * release DMA buffer from page table
259  */
260 int snd_trident_free_pages(struct snd_trident *trident,
261                            struct snd_util_memblk *blk)
262 {
263         struct snd_util_memhdr *hdr;
264         int page;
265 
266         if (snd_BUG_ON(!trident || !blk))
267                 return -EINVAL;
268 
269         hdr = trident->tlb.memhdr;
270         mutex_lock(&hdr->block_mutex);
271         /* reset TLB entries */
272         for (page = firstpg(blk); page <= lastpg(blk); page++)
273                 set_silent_tlb(trident, page);
274         /* free memory block */
275         __snd_util_mem_free(hdr, blk);
276         mutex_unlock(&hdr->block_mutex);
277         return 0;
278 }
279 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp